1 /* 2 * CIPSO - Commercial IP Security Option 3 * 4 * This is an implementation of the CIPSO 2.2 protocol as specified in 5 * draft-ietf-cipso-ipsecurity-01.txt with additional tag types as found in 6 * FIPS-188, copies of both documents can be found in the Documentation 7 * directory. While CIPSO never became a full IETF RFC standard many vendors 8 * have chosen to adopt the protocol and over the years it has become a 9 * de-facto standard for labeled networking. 10 * 11 * Author: Paul Moore <paul.moore@hp.com> 12 * 13 */ 14 15 /* 16 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006 17 * 18 * This program is free software; you can redistribute it and/or modify 19 * it under the terms of the GNU General Public License as published by 20 * the Free Software Foundation; either version 2 of the License, or 21 * (at your option) any later version. 22 * 23 * This program is distributed in the hope that it will be useful, 24 * but WITHOUT ANY WARRANTY; without even the implied warranty of 25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See 26 * the GNU General Public License for more details. 27 * 28 * You should have received a copy of the GNU General Public License 29 * along with this program; if not, write to the Free Software 30 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 31 * 32 */ 33 34 #ifndef _CIPSO_IPV4_H 35 #define _CIPSO_IPV4_H 36 37 #include <linux/types.h> 38 #include <linux/rcupdate.h> 39 #include <linux/list.h> 40 #include <linux/net.h> 41 #include <linux/skbuff.h> 42 #include <net/netlabel.h> 43 44 /* known doi values */ 45 #define CIPSO_V4_DOI_UNKNOWN 0x00000000 46 47 /* tag types */ 48 #define CIPSO_V4_TAG_INVALID 0 49 #define CIPSO_V4_TAG_RBITMAP 1 50 #define CIPSO_V4_TAG_ENUM 2 51 #define CIPSO_V4_TAG_RANGE 5 52 #define CIPSO_V4_TAG_PBITMAP 6 53 #define CIPSO_V4_TAG_FREEFORM 7 54 55 /* doi mapping types */ 56 #define CIPSO_V4_MAP_UNKNOWN 0 57 #define CIPSO_V4_MAP_STD 1 58 #define CIPSO_V4_MAP_PASS 2 59 60 /* limits */ 61 #define CIPSO_V4_MAX_REM_LVLS 256 62 #define CIPSO_V4_INV_LVL 0x80000000 63 #define CIPSO_V4_MAX_LOC_LVLS (CIPSO_V4_INV_LVL - 1) 64 #define CIPSO_V4_MAX_REM_CATS 65536 65 #define CIPSO_V4_INV_CAT 0x80000000 66 #define CIPSO_V4_MAX_LOC_CATS (CIPSO_V4_INV_CAT - 1) 67 68 /* 69 * CIPSO DOI definitions 70 */ 71 72 /* DOI definition struct */ 73 #define CIPSO_V4_TAG_MAXCNT 5 74 struct cipso_v4_doi { 75 u32 doi; 76 u32 type; 77 union { 78 struct cipso_v4_std_map_tbl *std; 79 } map; 80 u8 tags[CIPSO_V4_TAG_MAXCNT]; 81 82 u32 valid; 83 struct list_head list; 84 struct rcu_head rcu; 85 struct list_head dom_list; 86 }; 87 88 /* Standard CIPSO mapping table */ 89 /* NOTE: the highest order bit (i.e. 0x80000000) is an 'invalid' flag, if the 90 * bit is set then consider that value as unspecified, meaning the 91 * mapping for that particular level/category is invalid */ 92 struct cipso_v4_std_map_tbl { 93 struct { 94 u32 *cipso; 95 u32 *local; 96 u32 cipso_size; 97 u32 local_size; 98 } lvl; 99 struct { 100 u32 *cipso; 101 u32 *local; 102 u32 cipso_size; 103 u32 local_size; 104 } cat; 105 }; 106 107 /* 108 * Sysctl Variables 109 */ 110 111 #ifdef CONFIG_NETLABEL 112 extern int cipso_v4_cache_enabled; 113 extern int cipso_v4_cache_bucketsize; 114 extern int cipso_v4_rbm_optfmt; 115 extern int cipso_v4_rbm_strictvalid; 116 #endif 117 118 /* 119 * Helper Functions 120 */ 121 122 #define CIPSO_V4_OPTEXIST(x) (IPCB(x)->opt.cipso != 0) 123 #define CIPSO_V4_OPTPTR(x) ((x)->nh.raw + IPCB(x)->opt.cipso) 124 125 /* 126 * DOI List Functions 127 */ 128 129 #ifdef CONFIG_NETLABEL 130 int cipso_v4_doi_add(struct cipso_v4_doi *doi_def); 131 int cipso_v4_doi_remove(u32 doi, void (*callback) (struct rcu_head * head)); 132 struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi); 133 struct sk_buff *cipso_v4_doi_dump_all(size_t headroom); 134 struct sk_buff *cipso_v4_doi_dump(u32 doi, size_t headroom); 135 int cipso_v4_doi_domhsh_add(struct cipso_v4_doi *doi_def, const char *domain); 136 int cipso_v4_doi_domhsh_remove(struct cipso_v4_doi *doi_def, 137 const char *domain); 138 #else 139 static inline int cipso_v4_doi_add(struct cipso_v4_doi *doi_def) 140 { 141 return -ENOSYS; 142 } 143 144 static inline int cipso_v4_doi_remove(u32 doi, 145 void (*callback) (struct rcu_head * head)) 146 { 147 return 0; 148 } 149 150 static inline struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi) 151 { 152 return NULL; 153 } 154 155 static inline struct sk_buff *cipso_v4_doi_dump_all(size_t headroom) 156 { 157 return NULL; 158 } 159 160 static inline struct sk_buff *cipso_v4_doi_dump(u32 doi, size_t headroom) 161 { 162 return NULL; 163 } 164 165 static inline int cipso_v4_doi_domhsh_add(struct cipso_v4_doi *doi_def, 166 const char *domain) 167 { 168 return -ENOSYS; 169 } 170 171 static inline int cipso_v4_doi_domhsh_remove(struct cipso_v4_doi *doi_def, 172 const char *domain) 173 { 174 return 0; 175 } 176 #endif /* CONFIG_NETLABEL */ 177 178 /* 179 * Label Mapping Cache Functions 180 */ 181 182 #ifdef CONFIG_NETLABEL 183 void cipso_v4_cache_invalidate(void); 184 int cipso_v4_cache_add(const struct sk_buff *skb, 185 const struct netlbl_lsm_secattr *secattr); 186 #else 187 static inline void cipso_v4_cache_invalidate(void) 188 { 189 return; 190 } 191 192 static inline int cipso_v4_cache_add(const struct sk_buff *skb, 193 const struct netlbl_lsm_secattr *secattr) 194 { 195 return 0; 196 } 197 #endif /* CONFIG_NETLABEL */ 198 199 /* 200 * Protocol Handling Functions 201 */ 202 203 #ifdef CONFIG_NETLABEL 204 void cipso_v4_error(struct sk_buff *skb, int error, u32 gateway); 205 int cipso_v4_socket_setattr(const struct socket *sock, 206 const struct cipso_v4_doi *doi_def, 207 const struct netlbl_lsm_secattr *secattr); 208 int cipso_v4_socket_getattr(const struct socket *sock, 209 struct netlbl_lsm_secattr *secattr); 210 int cipso_v4_skbuff_getattr(const struct sk_buff *skb, 211 struct netlbl_lsm_secattr *secattr); 212 int cipso_v4_validate(unsigned char **option); 213 #else 214 static inline void cipso_v4_error(struct sk_buff *skb, 215 int error, 216 u32 gateway) 217 { 218 return; 219 } 220 221 static inline int cipso_v4_socket_setattr(const struct socket *sock, 222 const struct cipso_v4_doi *doi_def, 223 const struct netlbl_lsm_secattr *secattr) 224 { 225 return -ENOSYS; 226 } 227 228 static inline int cipso_v4_socket_getattr(const struct socket *sock, 229 struct netlbl_lsm_secattr *secattr) 230 { 231 return -ENOSYS; 232 } 233 234 static inline int cipso_v4_skbuff_getattr(const struct sk_buff *skb, 235 struct netlbl_lsm_secattr *secattr) 236 { 237 return -ENOSYS; 238 } 239 240 static inline int cipso_v4_validate(unsigned char **option) 241 { 242 return -ENOSYS; 243 } 244 #endif /* CONFIG_NETLABEL */ 245 246 #endif /* _CIPSO_IPV4_H */ 247